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=1/2·20
=10
phytagoras
tΔ=√26²-√10²
=√676-√100
=√576
=24
Ls=4(luas segitiga)
Ls=4(1/2·a·t)
=4(1/2·20·24)
=4(240)
=960
La=s²
=20²
=400
Lp limas= La+Ls
=400+960
=1360